Key Points
- Differences in residual activity of herbicides and the weed spectrum need to ber considered when selecting a post-emergence herbicide.
- Mesotrione is a broadleaf herbicide that also controls some grass weeds, particularly when they are small.
- Nicosulfuron is a grass weed herbicide that also controls some broadleaf weeds, but has less residual activity the mesotrione.
- Timing of post-emergence application is critical to good weed control.
- Hemlock is controlled well by both nicosulfuron and mesotrione; however mesotione is more effective at controlling large plants.